Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Stock-Based Compensation

Summary of compensation costs related to stock-based awards

The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):

	Three Months Ended
	March 31,
	2021		2020
Cost of revenue	$	39	$	28
Selling, general and administrative		640		492
Research and development		137		123
Total stock-based compensation		816		643
Tax effect on stock-based compensation		—		—
Net effect on net income (loss)	$	816	$	643

Summary of stock option activity

The following table summarizes the stock option transactions during the three months ended March 31, 2021 (in thousands, except per share data):

				Weighted-
				average
		Weighted-		Remaining
	Number of	average		Contractual	Aggregate
	Options	Exercise		Life	Intrinsic
Stock Options	Outstanding	Price		(in years)	Value
Balance as of January 1, 2021	1,885	$	4.42	6.17	$	9,713
Granted	—		—
Exercised	(185)		3.80
Canceled and expired	—		—
Balance as of March 31, 2021	1,700	$	4.48	6.32	$	12,199
Options vested as of March 31, 2021 and unvested options expected to vest, net of forfeitures	1,690	$	4.49	6.31	$	12,117
Options exercisable as of March 31, 2021	1,282	$	4.64	5.69	$	9,000

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the three months ended March 31, 2021 is presented below (in thousands, except per share data):

		Weighted-Average
		Grant Date
Stock Awards	Shares	Share Value
Non-vested as of January 1, 2021	1,022	$	5.27
Granted	23	$	15.37
Vested	(4)	$	4.17
Forfeited	—	$	—
Non-vested as of March 31, 2021	1,041	$	5.50

Summary of unvested at-risk performance shares

A summary of the status of our unvested at-risk, performance shares as of March 31, 2021 is presented below (in thousands, except per share data):

		Weighted-Average
		Grant Date
Stock Awards	Shares*	Share Value
Non-vested as of January 1, 2021	—	$	—
Granted	101	$	15.37
Vested	—	$	—
Forfeited	—	$	—
Non-vested as of March 31, 2021	101	$	15.37